// todo.html
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./index.css">
    <title>Document</title>
</head>

<body>
    <section class="todoapp">
        <header class="header">
            <h1>todos</h1>
            <input class="new-todo" autofocus autocomplete="off" placeholder="What needs to be done?" />
        </header>
        <section class="main">
            <input id="toggle-all" class="toggle-all" type="checkbox" />
            <label for="toggle-all">Mark all as complete</label>
            <ul class="todo-list">
                <!-- :class="{ completed: item.done }" -->
                <li class="todo">
                    <div>
                        <input class="toggle" type="checkbox" />
                        <label>学习vue</label>
                        <button class="destroy"></button>
                    </div>
                    <input class="edit" type="text" style="display: none;" />
                </li>
            </ul>
        </section>
        <footer class="footer">
            <span class="todo-count"> <strong></strong> 1 item left </span>
            <ul class="filters">
                <li><a href="">All</a>
                </li>
                <li><a href="">Active</a>
                </li>
                <li>
                    <!-- :class="{ selected: visibility == 'Completed'} -->
                    <a href="">Completed</a>
                </li>
            </ul>
            <button class="clear-completed">
                Clear completed
            </button>
        </footer>

    </section>
</body>

</html>